#' Cities.
#'
#' This is a dataset with the latitude and longitude of all cities on planet earth with greater than 1000 people.
#'
#' @format A data frame with 123,203 rows and 3 variables:
#' \describe{
#'   \item{country}{Country ISO code}
#'   \item{city}{City name}
#'   \item{lat}{Latitude}
#'   \item{lon}{Longitude}
#' }
#'
#' @name cities
#' @docType data
#' @source \url{https://github.com/echarts-maps/echarts-cities-js}
#' @keywords data
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